double billed by autopay

I have used auto pay on and off . In April I signed back up with autopay. 

I received a text message in May saying my autopay went through for 108.90

My plan is 50$ month I always end up paying 54.45 with taxes ETC .

 54.45 x 2 =108.90 so I I texted customer service and we all know how that goes, FOR OVER AN HOUR. 

Then I called customer service and we all know how that goes. THREE DIFFERENT PEOPLE OVER 3 HOURS. 

I was told that I could not get that money back until I paid again that day. 

So you double billed me, you won't give me that money back until I pay you another $54.45.?

I got on the website and unenrolled in autopay. Then I paid the $54.45 total. 

Then I disputed it with my bank. 

I just was looking at my bank account two days ago and it has been credited back to T-Mobile. 

I want my money back. I have paid every month. Including the one that I was double billed for. 

I don't know what to do anymore. I'm definitely not GIVING TMobile $108.90 for free. 

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They used to email me when I would make a payment and now they don't. It literally says on my receipt that they have sent a email to my email but no they have not.